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How Robust is the N=34 Subshell Closure?: First Spectroscopy of Ar-52
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics.ORCID iD: 0000-0003-0212-7497
Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany..
2019 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 122, no 7, article id 072502Article in journal (Refereed) Published
Abstract [en]

The first gamma-ray spectroscopy of Ar-52, with the neutron number N = 34, was measured using the K-53(p, 2p) one-proton removal reaction at similar to 210 MeV/u at the RIBF facility. The 2(1)(+) excitation energy is found at 1656(18) keV, the highest among the Ar isotopes with N > 20. This result is the first experimental signature of the persistence of the N = 34 subshell closure beyond Ca-54, i.e., below the magic proton number Z = 20. Shell-model calculations with phenomenological and chiral-effective-field-theory interactions both reproduce the measured 2(1)(+) systematics of neutron-rich Ar isotopes, and support a N = 34 subshell closure in Ar-52.

Place, publisher, year, edition, pages
American Physical Society, 2019. Vol. 122, no 7, article id 072502
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-245909DOI: 10.1103/PhysRevLett.122.072502ISI: 000459311800005Scopus ID: 2-s2.0-85062034151OAI: oai:DiVA.org:kth-245909DiVA, id: diva2:1296486
Note

QC 20190315

Available from: 2019-03-15 Created: 2019-03-15 Last updated: 2019-03-15Bibliographically approved

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